Partial Fault in a California Accident

Can you recover compensation if you were partly responsible?

Yes, potentially. California generally uses pure comparative negligence in accident injury cases. Sharing responsibility does not automatically prevent recovery, even if your share exceeds 50%. Your damages can be reduced to reflect your own responsibility. You still need a valid claim against another responsible party.

The California Supreme Court adopted this approach in Li v. Yellow Cab Co.. The rule is a starting point—not a guarantee of payment or a substitute for reviewing the evidence, applicable law, and insurance.

How a fault reduction works

For a simplified illustration, assume legally established damages of $100,000 and an injured person's share of responsibility of 20%. The comparative-fault reduction would be $20,000, leaving $80,000 before other limits and deductions.

These are invented figures to explain the arithmetic, not an MMG case result or an estimate of your case. Insurance limits, collectability, other legal rules, attorney fees, case expenses, and medical repayment obligations can affect what is actually received. Read more about medical bills and liens.

Your fault percentage and the value of your losses are separate questions. A percentage cannot tell you what your claim is worth without evidence of the damages and who is legally responsible for them.

What must support a claim that you share fault?

California's CACI 405 jury instruction explains that a defendant asserting the injured person's comparative negligence must establish negligent conduct and that the conduct was a substantial factor in causing the harm. An accusation alone is not proof.

Relevant questions include what each person did, what reasonable care required under the circumstances, and how the conduct contributed to the injury. The Judicial Council's official civil jury instruction collection includes CACI 405 and the related apportionment instruction, CACI 406. A readable reproduction of CACI 405 is also available.

Who decides the percentage?

During a claim, insurers and the people involved may disagree about responsibility. An adjuster's proposed allocation is a position to examine, not automatically a binding court decision. Settlement negotiations may resolve the dispute; if the case goes to trial, the factfinder evaluates the evidence under the applicable instructions.

Ask for the factual basis of a proposed reduction. Which actions are being alleged? What photos, witness statements, recordings, or other records support them? What contrary evidence was considered? Keep the explanation and related correspondence.

A police report can help an investigation, but it is not itself a civil judgment allocating damages. The absence of a citation also does not establish that someone was free from negligence. Tell counsel about any citation, hearing, admission, or prior decision so its particular significance can be assessed.

Examples of disputes that need closer review

One driver turned while another may have been speeding

An investigation may need to examine timing, visibility, signals, speed, and the opportunity to avoid impact. Neither the direction of travel nor one person's description determines the entire allocation. Video, vehicle positions, and witness observations may clarify the sequence.

Two vehicles changed position before a collision

Lane changes, merging, braking, or following distance may be disputed. Preserve the full recording rather than a selected clip; what happened before impact may matter. Avoid guessing at another vehicle's speed or distance when you did not observe it reliably.

A passenger is worried about the driver's mistake

Being a passenger in a vehicle whose driver may be responsible does not by itself establish that the passenger was negligent. Passenger claims need their own analysis, including potential claims against more than one driver and available insurance.

These are investigation examples, not predetermined fault percentages. Relevant questions can arise in car, truck, and motorcycle cases.

Evidence that can help resolve a fault dispute

Preserve what is available without risking your safety or interfering with emergency responders:

• Original photographs: vehicle positions, damage, road layout, signs, signals, visibility, and relevant road conditions.
• Video sources: dashcams and nearby cameras; note the location and approximate time promptly because recordings may be overwritten.
• Witness information: names, contact details, and what each witness actually observed.
• Reports and correspondence: report numbers, diagrams, citations, insurer letters, and written explanations of fault decisions.
• Injury and loss records: treatment records, work restrictions, receipts, and other documents supporting the claimed harm.

Keep original files and any available timestamps. Do not delete, edit, or selectively alter unfavorable material. If a vehicle may contain relevant electronic data, discuss preservation before repairs or disposal when feasible. The need for specialized analysis depends on the case.

What to do if an insurer says you caused the accident

Stay factual. Describe what you personally observed and say when you do not know. Do not guess at a legal percentage or change your account to fit what you think an adjuster wants to hear.

Ask for the decision and supporting reasons in writing. Keep a list of disputed points and documents that may clarify them. Before agreeing to a release or giving a detailed recorded statement to another party's insurer, consider discussing the request with counsel. Your own policy may require timely notice and cooperation, so do not simply ignore requests from your insurer.

Continue appropriate medical follow-up. Do not delay treatment to resolve a blame dispute. Keep any claim deadlines in view while discussions continue.

Partial fault is only one part of the legal analysis

More than one responsible party

Several people or businesses may have contributed to the harm. California distinguishes between categories of damages when allocating responsibility among defendants. For example, Civil Code section 1431.2 addresses several liability for noneconomic damages. A simple two-person percentage illustration does not resolve every multi-party case.

Insurance and other legal limits

A finding of fault does not establish how much insurance is available or whether a judgment can be collected. Separate rules may also restrict certain damages. For example, Civil Code section 3333.4 can limit noneconomic recovery for certain uninsured owners or drivers and certain drivers convicted of driving under the influence. Exceptions and the person's circumstances require review; lack of insurance is not itself a finding that the person caused the crash.

For an example of why the claim type matters, the California Supreme Court addressed a product-defect exception in Hodges v. Superior Court, available through Stanford's California Supreme Court Resources. That decision does not create a blanket exception for every uninsured claimant.

Filing deadlines still apply

California personal injury lawsuits generally have a two-year deadline. Public-entity claims can require an earlier administrative claim, commonly within six months. Exceptions and additional deadlines may apply. Ongoing negotiations or an unresolved fault dispute do not automatically extend the time to act. See the California Courts guides to personal injury cases and deadlines to sue.